Bevel-cut patch for tubes and other rubber goods



V .J. G. GROSS BEVEL CUT PATCH FOR TUBES' AND OTHER RUBBER GOODS NOV. 11, I brigjmml" 1196 2C, Re.

Reissued Nov. 11, 1930 UNITED STATES JACOB G. GROSS, OF SAN GABRIEL, CALIFORNIA BEVEL-CIUT PATCH FOR TUBES AND OTHER RUBBER GOODS Original No. 1,596,430, dated August 17, 1926, Serial No. 733,172, filed August 20, 1924. Application m reissue filed May 5, 1930. Serial No. 449,996.

This invention relates to improvements in rubber patches adapted to be used in patching rubber tire tubes and other rubber goods.

It is a broad object of this invention to provide an improved patch which has a bev eled edge.

It is very desirable in patching rubber goods, especially tire tubes, to provide a patch having a beveled edge for the reason that such an edge provides a very small projection which may be caught or rubbed so as to peel the patch from the tire. lleretofore, as far as I am aware, such a patch has been provided by molding. Each patch is formed of an outer layer of cured rubber and an inner layer of uncured rubber. In order to form a secure patch uncured rubber is necessary. However, in the process-of making 7 patches of cured and uncured rubber by molding, the edges of the uncured rubber become cured or partially cured, and especially so when a patch having a beveled edge is provided.

It is therefore an object of this invention to provide a patch having a beveled edge,

which is cut out of a sheet of material formed of a layer of cured rubber, a layer of uncured rubber and a layer of fabric, so that the edges of the layer of uncured rubber will not hecome cured or partially cured as has been experienced when the patches are molded.- It will readily be understood that when the edges of the uncured rubber are cured or par tially cured, that these edges do not firmly stick to the surface of the material being patched, but instead have a tendency to peel back, so that in the course of time, the complete patch is entirely peeled off from the article patched.

With the foregoing andother objects in view which will be made manifest in the following detailed description and pointed out in the appended claims, reference is had to the accompanying drawings for an illustrative embodiment of the invention, wherein:

Figure 1 is a top plan view of the improved rubber patch, and

Fig. 2 is a vertical section through a portion of a tire tube to which one of the improved patches has been applied. 1

Referring to the accompanying drawing wherein similar reference characters designate similar parts throughout, the improved patch consists of a top layer 10 ofcured rubber. Beneath this layer of cured rubber there is a second layer 11 which is formed of uncured rubber and on the under side of the layer 11 of uncured rubber there is a layer of protective fabric 12. The edges of all of the layers are beveled, and the patch may be produced in the following manner: A section of patching material is taken consisting of a layer of cured rubber, uncured rubber and fabric and this is cut to produce the beveled edge, such as by cutting it by a knife in an-inclined position. The beveled edges on the layer 11 of uncured rubber and on the layer 10 of curedrubber are indicated at 13 and 14 respectively. The patch so produced is characterized by the fact that the thin edges of the uncured layer 11 are/neithercured nor partially cured.

When it is desired to mend a rubber article, such as a tire tube T, cement may be appied to the article around the puncture or aperture therein. When this cement is substantially dry, the layer of protective fabric 12 is removed and the patch applied in the usual manner. It will be readily understood that the improved patch has many advantages which are present in the conventional patching material in that it has a layer of cured rubber giving the patch the desired strength and the uncured rubber which is especially advantageous in forming a secure bond with the tire tube T. p

The advantages of the patch of the improved construction ov,er the conventional patch reside in the factthat the edges of the uncured layer- 11 which project from beneath the edges of the cured layer are neither cured nor partially cured, so that these edges cling tenaciously to the tire tube. In this manner the edges of the uncured layer 11 are not apt to loosen from the tire tube T or to start peeling back. It Will be readily understood that if the edges of the patch should patch resides in the fact that the edges of the cured rubber, a. layer of uncure patch are beveled so that there will be-no sharp edge adapted to be caught .by or rubbed by the interior of a tire casing, and consequently any relative movement between the tire casing and the tire tube will not tend to rub off or peel oil the patch. The patch is round, and the beveled edge is annular. This shape is preferable because the beveled edge has no irregularities or corners which would provide places where the atch might be started to peel from the tube T. F urthermore, in a round patch the stresses-are balanced, and there is but little danger, if any, of the patch being pulled from place due to such stresses. The beveled edge is knife-cut, as distinguished from a molded edge, and it is therefore possessed of an exceedingly sharp edge of uncured rubber which adheres very tenaciously to the tube T.

From the aboy e described construction it will be appreciated that an improved tire patch is provided having two layers, one of ber, and that both layers have beveled edges 'With the edges of the layer of uncured rubber the invention as defined by the appended claims. a

I claim as my invention:

1. A rubber patch consisting of a layer of cured rubber and a layer of uncured rubber, the edges of both of said layers being beveled with the edges of the uncured layer projecting from beneath the edges of the cured layer, the edges of said uncured layer being characterized by being neither cured nor partially cured.

layer of cured rubber, said two layers beinground and both having annular beveled edges. In testimony whereof, I have-hereunto set my hand at Los Angeles, Los Angeles county,

day of April, 1930.

California, this 30th JACOB G GROSS.

uncured rubber and the other of cured rub- 2. A rubber patch consisting of a layer of rubber therebeneath having its edges projecting from-beneath, the edges of said layer of cured rubber,and a layer of fabric beneath said layer of uncured rubber, the edges of said fabric projecting from beneath the edges of said layer of uncured rubber, all of said edges being beveled.

3. A rubber patch consisting of a layer of cured rubber, and a layer of ,uncured rubber therebeneath having ,its edges projecting from beneath the edges of the layer of cured til 

